Malicious PDF — malware analysis report

Static analysis result for SHA-256 16446d03a1a1aeae…

MALICIOUS

PDF

35.0 KB Created: 2020-08-20 09:03:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 76726fcd9712c1548870c3c24e9bee23 SHA-1: afbf8a8000e1e0f881d75478c18a1e941b4d48d2 SHA-256: 16446d03a1a1aeae3dbf5e68ea94ad6032503cfb0da98bb4eac2aba334885353
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link to a known malicious redirector, ttraff.ru, which is associated with a link farm heuristic. The document body, though heavily obfuscated, contains the same product keyword found in the malicious URL, suggesting a lure. The presence of numerous external PDF links further supports the link farm classification, indicating a likely attempt to drive traffic to malicious sites or distribute further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://ttraff.ru/pify?keyword=be+koool+soft+cooling+soft+gel+sheets
    • http://files.keepitmovinginc.org/uploads/1/3/1/4/131453124/835882.pdf
    • http://ropupejag.the5thbird.com/uploads/1/3/1/4/131483044/wutun-mubufujeguka.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0449/2728/7451/files/fugupurotebemajo.pdf
    • https://cdn.shopify.com/s/files/1/0435/5021/2264/files/61868675626.pdf
    • https://cdn.shopify.com/s/files/1/0427/7446/2631/files/29211665659.pdf
    • https://cdn.shopify.com/s/files/1/0445/2201/2831/files/88800983135.pdf
    • https://cdn.shopify.com/s/files/1/0432/3645/8654/files/moy_games_free.pdf
    • https://cdn.shopify.com/s/files/1/0434/7301/0840/files/92503783275.pdf
    • https://cdn.shopify.com/s/files/1/0430/9958/6714/files/cr-_10s_pro_filament_guide.pdf
    • https://cdn.shopify.com/s/files/1/0428/0070/9791/files/63956013159.pdf
    • https://cdn.shopify.com/s/files/1/0429/1824/8601/files/21914697462.pdf
    • https://cdn.shopify.com/s/files/1/0435/8825/5912/files/the_seekers_daniel_boorstin.pdf
    • https://cdn.shopify.com/s/files/1/0434/4876/2529/files/sinapaforalub.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004c26.bin
26ed261406043c2b43e0295bd8f18fedd4780edf139f9625167f75fdf632abff
pdf-font-stream PDF embedded font (sfnt) at offset 0x4C26 4948 bytes
font_01_sfnt_off00005d04.bin
813060dd85b16bf2c476826904144bc2f4598994213a5a0712d7533db8d93491
pdf-font-stream PDF embedded font (sfnt) at offset 0x5D04 10012 bytes